package com.xjt.wx_admin.util;

import cn.hutool.core.codec.Base64;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
/********************************************************************************
 * Description: 二维码制作工具类 
 * @author zhangdi
 * @version 1.0
 */
public class QRCodeUtil {
    private static final String CHARSET = "utf-8";  
    private static final String FORMAT_NAME = "JPG";  
    // 二维码尺寸  
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度  
    private static final int WIDTH = 60;  
    // LOGO高度  
    private static final int HEIGHT = 60;  
      
  
    /** 
     * 生成二维码 
     * @param content   源内容
     * @return      返回二维码图片 
     * @throws Exception 
     */  
    public static String createImage(String content){
        Hashtable hints = new Hashtable();  
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);  
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                    hints);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        int width = bitMatrix.getWidth();  
        int height = bitMatrix.getHeight();  
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
        for (int x = 0; x < width; x++) {  
            for (int y = 0; y < height; y++) {  
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);  
            }  
        }
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        try {
            ImageIO.write(image, "png", stream);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return Base64.encode(stream.toByteArray());
    }  
  
    /** 
     * 在生成的二维码中插入图片 
     * @param source 
     * @param imgPath 
     * @param needCompress 
     * @throws Exception 
     */  
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {  
        File file = new File(imgPath);  
        if (!file.exists()) {  
            System.err.println("" + imgPath + "   该文件不存在！");  
            return;  
        }  
        Image src = ImageIO.read(new File(imgPath));  
        int width = src.getWidth(null);  
        int height = src.getHeight(null);  
        if (needCompress) { // 压缩LOGO  
            if (width > WIDTH) {  
                width = WIDTH;  
            }  
            if (height > HEIGHT) {  
                height = HEIGHT;  
            }  
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);  
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
            Graphics g = tag.getGraphics();  
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图  
            g.dispose();  
            src = image;  
        }  
        // 插入LOGO  
        Graphics2D graph = source.createGraphics();  
        int x = (QRCODE_SIZE - width) / 2;  
        int y = (QRCODE_SIZE - height) / 2;  
        graph.drawImage(src, x, y, width, height, null);  
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);  
        graph.setStroke(new BasicStroke(3f));  
        graph.draw(shape);  
        graph.dispose();  
    }


    public static void main(String[] args) {
        String base64 = createImage("Http://www.baidu.com");
        System.out.println(base64);
    }

}
